JP2006245878A - Speaker, and electronic apparatus and device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker and an electronic apparatus and device for use in an acoustic apparatus, wherein it is intended to decrease the thickness of the speaker and the electronic apparatus and device. <P>SOLUTION: A plurality of small pits 27a are formed to constitute the speaker on the inner peripheral side of a coupling part with a voice coil 28 of a vibration plate 27, whereby the shape rigidity of the vibration plate 27 is increased to intend to reduce an unwanted resonation. Hence, this arrangement can be made to realize stabilization of the sound pressure frequency characteristics and a thin type of speaker due to the decrease in the overall height dimension of the vibration plate 27. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a speaker used in various audio equipment and information communication equipment.

  The prior art will be described with reference to FIGS.

  FIG. 7 is a sectional view of a conventional speaker, and FIG. 8 is a plan view of a diaphragm used in the speaker.

  As shown in FIGS. 7 and 8, the magnetized magnet 1 is sandwiched between the upper plate 2 and the yoke 3 to constitute an inner magnet type magnetic circuit 4. A frame 6 is coupled to the yoke 3 of the magnetic circuit 4.

  A diaphragm 7 made of a resin film sheet is coupled to the peripheral portion of the frame 6, and a voice coil 8 is coupled to the diaphragm 7 and coupled so as to fit into the magnetic gap 5 of the magnetic circuit 4. is doing.

  Here, the cross-sectional shape of the diaphragm 7 on the inner peripheral side from the coupling portion of the diaphragm 7 with the voice coil 8 is formed in a substantially dome shape.

For example, Patent Document 1 is known as prior art document information relating to the invention of this application.
JP 2004-356833 A

  As for the above-mentioned speakers, there is a strong demand from the market to reduce the thickness of electronic devices such as mobile phones, and the speakers used in these sets are also strongly required to be thin.

  In particular, for a cellular phone capable of stereo distribution, speakers must be arranged on both sides of a video display means such as a liquid crystal, and the area occupied by the speakers is twice that of the conventional monaural system.

  Further, with respect to the signal processing and audio amplifying means, as compared with the conventional monaural system, the area occupied by the circuit becomes large for a mobile phone capable of stereo reception.

  For the above reasons, there is a strong demand from the market to reduce the thickness of speakers.

  With regard to this thinning, the arrangement of the cellular phone is devised without overlapping the components as much as possible. However, in recent years when folding cellular phones are becoming mainstream, it is inevitably difficult to reduce the thickness.

  Therefore, in order to reduce the thickness of electronic devices such as mobile phones, it is essential to reduce the thickness of the speaker.

  For this reason, if the height of the diaphragm is designed to be thin in order to reduce the thickness of the speaker, the shape rigidity of the diaphragm is reduced, unnecessary resonance is generated, and the sound pressure frequency characteristic is hindered. I had it.

  This is because the resonance from the inner periphery of the voice coil, that is, from the voice coil to the inner periphery of the diaphragm, is circular, and the dome-shaped curvature of the cross section is changed to reduce the thickness. The problem is that the diaphragm is close to a planar shape, the shape rigidity is lowered, and unnecessary resonance occurs frequently.

  In addition, since the diaphragm is made of a resin film sheet, the internal loss is small, and therefore resonance tends to occur remarkably.

  An object of the present invention is to solve the above-mentioned problems and to provide an excellent speaker capable of reducing unnecessary resonance of the diaphragm and reducing the thickness.

  In order to achieve the above object, the present invention provides a frame coupled to a magnetic circuit, a diaphragm coupled to an outer peripheral portion of the frame and composed of a sheet material, and coupled to the diaphragm. The speaker is composed of a voice coil disposed in the magnetic gap of the magnetic circuit, and a plurality of small depressions are formed on the inner peripheral side of the coupling portion with the voice coil of the diaphragm to constitute the speaker. .

  By adopting this configuration, by forming a large number of small depressions in the diaphragm, the shape rigidity of the diaphragm can be increased, unnecessary resonance can be reduced, and the overall height of the diaphragm can be reduced in thickness. Therefore, it is possible to realize a thin speaker and a stable sound pressure frequency characteristic.

  As described above, in the present invention, a speaker is configured by forming a large number of small depressions on the inner peripheral side of the coupling portion of the diaphragm with the voice coil.

  By adopting this configuration, by forming a large number of small depressions in the diaphragm, the shape rigidity of the diaphragm can be increased, unnecessary resonance can be reduced, and the overall height of the diaphragm can be reduced in thickness. Can do.

  Therefore, the speaker can be made thinner and the sound pressure frequency characteristics can be stabilized, and its industrial value is very large.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
Hereinafter, the first to third aspects of the present invention will be described with reference to the first embodiment.

  FIG. 1 is a cross-sectional view of a speaker according to an embodiment of the present invention.

  FIG. 2 is a plan view of the diaphragm.

  As shown in FIGS. 1 and 2, a magnetized magnet 21 is sandwiched between an upper plate 22 and a yoke 23 to form an internal magnet type magnetic circuit 24.

  A frame 26 is coupled to the yoke 23 of the magnetic circuit 24.

  The outer periphery of the diaphragm 27 made of a sheet material and formed with a number of small depressions 27a is bonded to the peripheral portion of the frame 26 and formed on the inner peripheral portion of the connecting portion with the voice coil 28.

  One end of the voice coil 28 is coupled to the diaphragm 27 and the other end is coupled so as to fit into the magnetic gap 25 of the magnetic circuit 24.

  Here, the cross-sectional shape of the diaphragm 27 on the inner peripheral side from the coupling portion with the voice coil 28 is substantially dome-shaped, and a part of the cross-sectional shape is formed by forming a number of square-shaped depressions 27a. ing.

  Further, the cross-sectional shape of the recess 27a is a straight line.

  The recess 27a is desirably provided in the vicinity of the central portion of the substantially dome shape where unnecessary resonance is likely to occur.

  With this configuration, by forming the recess 27a in the diaphragm 27, the overall height of the diaphragm 27 can be reduced, the shape rigidity can be increased, unnecessary resonance can be reduced, and the speaker can be reduced in thickness and sound. Stabilization of the pressure frequency characteristics can be realized.

  Here, the shape of the depression 27a provided in the diaphragm 27 is not limited to the depression formed in a square shape in cross section and a linear shape as shown in the present embodiment, The shape shown in FIGS. 3 and 4 may be used.

  The configuration of the speaker shown in FIG. 3 and FIG. 4 is the same as that described above, so the description thereof will be omitted, and only different parts will be described below.

  The shape of the depression 27b provided in the diaphragm 27 is a depression formed in a circular shape, that is, a round shape in a planar shape, and in an inverted dome shape, that is, a curved shape in cross section.

  With this configuration, since the planar shape of the recess 27b is circular, that is, a round shape, it is possible to easily produce a press mold for producing the diaphragm 27 and produce the diaphragm 27. It is possible to improve the durability and durability of the press mold.

  Further, the cross-sectional shape of the recess 27b is formed in an inverted dome shape, that is, a curved shape, so that the shape rigidity of the recess itself is improved as compared with a recess formed in a cross-sectional shape, and the vibration of the diaphragm 27 On the other hand, there is an effect of further reducing unnecessary resonance.

  Further, similarly to the above, the production of the press die for producing the vibration plate 27 and the production of the vibration plate 27 can be easily carried out, thereby improving the productivity and improving the durability of the press die. Yes, the effect is tremendous.

(Embodiment 2)
The second aspect of the present invention will be described below with reference to the second embodiment.

  FIG. 5 is a cross-sectional view of a main part of a mobile phone which is an electronic apparatus according to an embodiment of the present invention.

  As shown in FIG. 5, a mobile phone 80 is configured by mounting any one speaker 30 according to claims 1 to 3.

  Here, as a configuration of the cellular phone 80, components such as the speaker 30, the electronic circuit 40, the liquid crystal display 60, and the like are mounted inside the exterior case 70 to constitute a main part of the cellular phone 80.

  With this configuration, it is possible to reduce the thickness and size of an electronic device such as a mobile phone equipped with the speaker while realizing a reduction in the thickness of the speaker and stabilization of the sound pressure frequency characteristics.

  In the present embodiment, an example in which a mobile phone, which is a mobile communication device, is installed as an electronic device has been described. However, the present invention is not limited to this, and is a video component such as an audio minicomponent system or a television. Also good. That is, the present invention can be applied to all electronic devices equipped with speakers.

(Embodiment 3)
The third aspect of the present invention will be described below with reference to the third embodiment.

  FIG. 6 is a cross-sectional view of an automobile showing an apparatus according to an embodiment of the present invention.

  In the present embodiment, an automobile as a device is configured by mounting the speaker according to any one of claims 1 to 3.

  That is, the speaker 30 is mounted on the rear tray of the automobile 90.

  By adopting this configuration, it is possible to reduce the thickness, size, size, and space factor of automobiles and other devices equipped with this speaker while realizing a thinner speaker and stabilizing sound pressure frequency characteristics. Can do.

  In addition, although this Embodiment demonstrated the example mounted in the motor vehicle as an apparatus, it is not limited to this, A moving apparatus, such as a train and a ship, Furthermore, structures, such as a house, may be sufficient. In other words, the present invention can be applied to all devices that are equipped with speakers.

  The speaker, electronic device, and apparatus according to the present invention are electronic devices such as audiovisual equipment, information communication equipment, and game equipment that require stabilization of sound pressure frequency characteristics, thinning, miniaturization, compactness, and improvement in space factor. It can be applied to devices such as equipment and automobiles.

Sectional drawing of the speaker in one embodiment of this invention The top view of the diaphragm in one embodiment of the present invention Sectional drawing of the speaker in one embodiment of this invention The top view of the diaphragm in one embodiment of the present invention Sectional drawing of the principal part of the electronic device in one embodiment of this invention Sectional drawing of the apparatus in one embodiment of this invention Cross-sectional view of a conventional speaker Plan view of conventional diaphragm

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnet 2 Upper plate 3 Yoke 4 Magnetic circuit 5 Magnetic gap 6 Frame 7 Diaphragm 8 Voice coil 21 Magnet 22 Upper plate 23 Yoke 24 Magnetic circuit 25 Magnetic gap 26 Frame 27 Diaphragm 27a Depression 27b Depression 28 Voice coil 30 Speaker 40 Electron Circuit 60 Liquid crystal display 70 Exterior case 80 Mobile phone 90 Automobile

Claims (5)

A frame coupled to the magnetic circuit, a diaphragm coupled to the outer periphery of the frame and made of a sheet material, and coupled to the diaphragm, and a part thereof is disposed in the magnetic gap of the magnetic circuit. A speaker comprising a voice coil, wherein a plurality of small depressions are formed on the inner peripheral side of the connecting portion of the diaphragm with the voice coil. The speaker according to claim 1, wherein a planar shape of the recess is a circle. The speaker according to claim 1 or 2, wherein a cross-sectional shape of the depression is formed in an inverted dome shape. An electronic device on which any one of the speakers according to claim 1 is mounted. A device on which any one of the speakers according to claim 1 is mounted.

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